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 #include &lt;QtUiTools&gt;
 #include &lt;QtGui&gt;
 #include &quot;textfinder.h&quot;

 TextFinder::TextFinder(QWidget *parent)
     : QWidget(parent)
 {
     QWidget *formWidget = loadUiFile();

     ui_findButton = qFindChild&lt;QPushButton*&gt;(this, &quot;findButton&quot;);
     ui_textEdit = qFindChild&lt;QTextEdit*&gt;(this, &quot;textEdit&quot;);
     ui_lineEdit = qFindChild&lt;QLineEdit*&gt;(this, &quot;lineEdit&quot;);

     QMetaObject::connectSlotsByName(this);

     loadTextFile();

     QVBoxLayout *layout = new QVBoxLayout;
     layout-&gt;addWidget(formWidget);
     setLayout(layout);
     setWindowTitle(tr(&quot;Text Finder&quot;));

     isFirstTime = true;
 }

 QWidget* TextFinder::loadUiFile()
 {
     QUiLoader loader;

     QFile file(&quot;:/forms/textfinder.ui&quot;);
     file.open(QFile::ReadOnly);

     QWidget *formWidget = loader.load(&amp;file, this);
     file.close();

     return formWidget;
 }

 void TextFinder::loadTextFile()
 {
     QFile inputFile(&quot;:/forms/input.txt&quot;);
     inputFile.open(QIODevice::ReadOnly);
     QTextStream in(&amp;inputFile);
     QString line = in.readAll();
     inputFile.close();

     ui_textEdit-&gt;append(line);
     ui_textEdit-&gt;setUndoRedoEnabled(false);
     ui_textEdit-&gt;setUndoRedoEnabled(true);
 }

 void TextFinder::on_findButton_clicked()
 {
     QString searchString = ui_lineEdit-&gt;text();
     QTextDocument *document = ui_textEdit-&gt;document();

     bool found = false;

     if (isFirstTime == false)
         document-&gt;undo();

     if (searchString == &quot;&quot;) {
         QMessageBox::information(this, tr(&quot;Empty Search Field&quot;),
                 &quot;The search field is empty. Please enter a word and click Find.&quot;);
     } else {

         QTextCursor highlightCursor(document);
         QTextCursor cursor(document);

         cursor.beginEditBlock();

         QTextCharFormat plainFormat(highlightCursor.charFormat());
         QTextCharFormat colorFormat = plainFormat;
         colorFormat.setForeground(Qt::red);

         while (!highlightCursor.isNull() &amp;&amp; !highlightCursor.atEnd()) {
             highlightCursor = document-&gt;find(searchString, highlightCursor, QTextDocument::FindWholeWords);

             if (!highlightCursor.isNull()) {
                 found = true;
                 highlightCursor.movePosition(QTextCursor::WordRight,
                                        QTextCursor::KeepAnchor);
                 highlightCursor.mergeCharFormat(colorFormat);
             }
         }

         cursor.endEditBlock();
         isFirstTime = false;

         if (found == false) {
             QMessageBox::information(this, tr(&quot;Word Not Found&quot;),
                 &quot;Sorry, the word cannot be found.&quot;);
         }
     }
 }</pre>
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